Error ? --pw-min is a reserved parameter for Prince attack mode

Hi guys,

i just downloaded this program today. I loadet some hash pw into the program and I started it. But first of all i get an Error Message of  --pw-min is a reserved parameter for Prince attack mode. I change some paramter but always the error appear on my screen. Can anyone help me ?

I got a second question.

Is it possible to crack md5 Hash pw´s ? I sniff some with Wireshark and i only get the hash values of the pakets.